Interior crack inside yixing lid
i think your options may be to either roll the dice and keep using it or use it as a decoration only.
i'd just keep using it for tea.
i'd just keep using it for tea.
Ahh thanks for the advice, honestly I was just going to keep using it anyways! Unfortunately I bought it at a shop on holiday in Hong Kong and I don't have any real way to contact them anymore. I'm guessing I shouldn't preheat with boiling water then 

The crack in his pot is more severe and extensive. I think it is likely to separate whereas yours is likely to remain the same.
Hopefully OP did not spend too much on this defective modern teapot.